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1. The diffusion is the net movement of particles from an area of higher concentration
to an area of lower concentration. It is a natural process.
2. Enzymes control and catalyse many chemical reactions in living things. Which of
the following process that is not controlled by enzymes.
Protein synthesis / photosynthesis / diffusion / respiration
3. Substances such as oxygen can enter and leave cells by diffusion.
Look at the diagrams of five cells.
The dots show the concentration of oxygen.
Which diagram shows the diffusion of oxygen?
Choose A, B, C, D or E.
4. The diagrams show air sacs from the lungs of three different people.
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What is the scientific name for the air sacs in lungs?
(ii) 1 His alveoli has more surface area than John or Alan
2 His alveoli has more blood capillaries so higher chance of diffusion…read more